title: Polymorphism at the ref(2)P locus in Drosophila melanogaster: preliminary experiments concerning the selection mechanisms involved in its maintenance.
abstract: It has been shown previously that a polymorphism for two alleles of the ref(2)P locus is a regular feature of French natural populations of Drosophila melanogaster and that this is maintained in laboratory populations raised in cages. In this paper, an experimental population and egg-collection experiments are reported. Differential survival of the three genotypes would be the main factor leading to the equilibrium frequencies, working only in drastic conditions of larval competition.
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000494:pharmacology*; D004331:Drosophila melanogaster / Q000235:genetics*; D004351:Drug Resistance; D005787:Gene Frequency; D005796:Genes; D005838:Genotype; D010641:Phenotype; D011110:Polymorphism, Genetic
chemical_list: D002245:Carbon Dioxide